version 1 .
; Definitions for non-modem-hardware-specific telephony interactions.

ModemPresent = <modem @type symbol @devicePath string @dataspace #!any> .

; Assertion. Describes an ongoing call.
ActiveCall = <call-state @callId CallId @direction CallDirection @type CallType @peer string @peerNumberType NumberType @state CallState> .
CallId = int .
CallDirection = =mo / =mt .
CallType = =voice / =data / =fax .
NumberType = =unknown / =international / =national .
CallState = =hold / =original / =connect / =incoming / =waiting / =end / =alerting .

; Message. Triggers call answering.
AnswerCall = <answer-call @callId int> .

; Message. Triggers call rejection or disconnection.
DisconnectCall = <disconnect-call @callId CallIdSelector @cause ReleaseCause> .
CallIdSelector = @specificCall int / @allCalls =all .
ReleaseCause =
/ =unassignedNumber
/ =normal
/ =busy
/ =noUserResponding
/ =callRejected
/ =destinationOutOfOrder
/ =normalUnspecified
/ =incompatibleDestination
.

; Message. Starts an outgoing call. Assumes `international` NumberType.
PlaceCall = <place-call @devicePath string @peer string> .

; Assertion. Some call is active.
CallInProgress = <call-in-progress> .